$whereSql = empty($channelid) ? " WHERE arc.channel > 0  AND 
arc.arcrank > -2 " : " WHERE arc.channel = '$channelid' AND 
arc.arcrank > -2 ";

   $query = "SELECT arc.id,arc.typeid,arc.senddate,arc.flag,arc.ismake,
    arc.channel,arc.arcrank,arc.click,arc.title,arc.color,arc.litpic,
    arc.pubdate,arc.mid
    FROM `$maintable` arc
    $whereSql
    ORDER BY $orderbyField DESC";

    $query = "SELECT arc.id,arc.typeid,addon.huohao,arc.flag,arc.ismake,arc.channel,
    arc.arcrank,arc.click,arc.title,arc.color,arc.litpic,arc.pubdate,arc.mid
    FROM `$maintable` arc,`dede_addonarticle` addon,`dede_arctype` act where (arc.id=addon.aid) 
    and (arc.typeid=act.id)$whereSql ORDER BY $orderbyField DESC";